Electric tie tamper



June 30, 1953 L. TARWATER 2,643,649

ELECTRIC TIE TAMPER Filed Aug. 20, 1949 2 Sheets-Sheet l f/.m 38 30 37 34 3e 25 24 23 22 33 'fz-'J /f/r l- Il FIG. l.

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'o HWP lmp' 'o INVENTOR i l l l 96 LAwson rARwMER 95 /f lll ATTORNEYS June 30, w53 L. TARWATER 2,643,649

ELECTRIC TIE TAMPER Filed Aug. 20, 1949 2 Sheets-Sheet 2 ,f (j) INVENTOR 24, ALAWSON TARWATER 34 34 ATTORNEYS Patented nJune 30, 1953 Lawson Tarwater, Redlands, Calif., assignor to Tarwater Railway Supply Co., a corporation of California Application August 20, 1949, Serial No. 111,421

Y This invention has to do with power-driven, manually held tamping machines.

. An object of this invention is to provide a novel electrical tamping machine which is easy to operate.

A further object is to provide an electrical tamping machine adapted to be manually held which has a rapid tamping action.

Still another object of the invention is to provide a tamping machine of the type indicated which is constructed of a plurality of subassemblies or sections detachably joined whereby the same can .be economically manufactured and assembled and readily repaired.

Another object is to provide an electrical tamping machine which is so designed that several of the machines can be operated from one portable generator.

A further object is to provide a tamping machine having an electrical motor and a simplified drive means for transmitting the rotative motion of the motor drive shaft into reciprocatory rectilinear movement to operate a tamping tool.

Another object is to provide a tamping tool having a shock absorbing handle mounting.

These and other objects will be apparent from the drawings and the following description thereof.

Referring to the drawings:

Fig. 1 is an elevational view lof a Ytarnping machine embodying the invention;

Fig. 2 is a plan view of the machine of Fig. l;

Fig. 3 is a sectional elevational view on an enlarged scale of the machine of Fig. 1, the planes of the view being indicated by the several lines 3 3 on Figs. 4-10, inclusive;

Fig. 4 is a section on line 4 4 of Fig. 3;

Fig. 5 is a section on line 5 5 of Fig. 3; Fig. 6 is a section on line 6 6 of Fig. 3; Fig. 7 is a section on line '1 1 of Fig. 3; Fig. 8 is a section on line 8 8 of Fig. 3; Fig. 9 is a section on line 9 9 of Fig. 3; and Fig. 10 is a section on line I 0 l0 of Fig. 3.

More particularly describing the invention, reference numeral Il generally indicates the casing f the machine and in Fig. 1 a tamping tool l2 is shown in broken lines extending from the lower end of the machine. As will later appear, various tools may be used with the machine.

The upper end of the casing is formed by a motor housing i4 which includes an annular wall l from which extend radially inwardly projecting ribs I6 for supporting a motor I'l adapted to iit tightly therein. The upper end of the 1 Claim. (Cl.l 125-31) therebetween and on the bolts.

motor housing is provided with a dome-like end wall 26 which is provided withr apertures 2| for circulation of air. Centrally of the fwall 20 there is provided a switch housing 22 defining a recess 23 closed by a switch plate 24 uponwhch is mounted a suitable electrical switch 25.

The domed wall 20 is also provided with a cylindrical inwardly projecting wall 26 for the reception of a bearing 2l which. receives the motor shaft 28.

The domed wall 20 of the motor housing is I also provided with a pair of parallel diametrioally opposite ribs 29 which support a handle assembly 30. The assembly is a pair of annular plates 3l and 32, the lower plate 32 being secured by bolts 33 to ribs 29. Bolts 34 connect the plates which are spaced apart by intermediate springs Outer springs 36 are interposed between washers 3'! at the bolt heads and the upper plate. Welded or otherwise secured to the top plate are handles 38 and 3B.

The lower or inner end of the motor housing includes a thickened wall portion which defines an opening 43. l

Mounted in abutting relation with the motor housing is a gearhousing 44 which is made up of an annular wall i5 and an upper or outer end wall 46. The latter is bored at l'i and counterbored at 48 for the purpose of receiving the motor shaft 29 and bearing 56, respectively, the motor shaft having an enlarged end 5I which extends through the bore lll.

The gear housing also includes aycircular recess 52 which receives a bearing 53 for supporting a gear shaft 512; This shaft is further supported in bearing 55 which is mounted in a gear plate 57 at the lower end of the gear housing. The shaft 54 is provided with the two gear wheel sections 59 and til which rotate with the shaft, gear wheel element 59 being positioned to mesh with gear teeth formed on the enlarged end 5| of the motor shaft.

A lblower 62 is mounted on the motor shaft for rotation therewith and iits within the opening 43 at the lower end of the motor housing'.

Beyond the gear plate 5l is a cam housing 5d which is generally annular in shape, having an enlarged cylindrical bore 55 therein and beyond this, a bore 66 of lesser diameter. Above the bore 66 is a bore 6l which is smaller than bore 66. A radial and two-way thrust bearing, generally indicated by 68, is mounted in the bore 66 for supporting a drive shaft 19. This shaft carries a pinion 'll at its upper end, the pinion being keyed to the shaft as shown and being held thereon by means of a nut 72. The pinion meshes with the gear wheel 50 of the shaft 54.

The lower end of the drive shaft 78 is provided with an enlarged head 'M which mounts a cam follower consisting of a roller 75 mounted for rotation upon a stud Shaft 15 which is mounted radially in the head 7d, the shaft being pressed into a bore 'Il' in the part 11%. A roller bearing 'i5' may be interposed between the roller and shaft. Opposite the follower 75, the head is provided with a radially extending counterweight section i3 to counterbalance the cam follower.

The cam follower 15 is adapted to ride the cam surface Sii of a circular cam 8i which is mounted on a striker bar S2. The striker bar includes a hexagonal section S3 which is received -within a bushing dit or" similar internal shape. The bushing is mounted in the bore 85 of a striker housing B6. A spring 81 serves to yield- Yably urge the cam toward the cam follower.

The striker housing is also provided .with a second bushing, indicated by, which has a cylindrical bore de for receiving a cylindrical end section 9@ of the striker bar. the bushings serves to act as a seal. assembiy is also provided at the upper end of the striker housing.

It will be apparent that rotation of the motor shaft rotates the drive shaft l0 through the medium cf the gears interposed between the two.

bled or held together in the following manner.

The motor housing, gear housing, and earn housing are secured by bolts H30 extending through suitabie bores lili in the cam housing, bores i532 in the gear plate, bores |93 in the gear housing,

and threaded into tapped bores 04 in the motor housing. The striker housing is secured to the cam housing by means of bolts [S6 which pass through flanges lill and |08, respectively, on

An O ring 9i inY A seal ring,

4 the cam and striker housing. The bushing housing 94 is secured to the striker housing by means ofthe bolts H0 which pass through anges Hl and I I2 on the striker and bushing housings, respectively.

I claim: Y

In an electric tamping machine, a motor housing having `handle means thereon at its outer end, a gear housing secured to the inner end of said motor housing, a motor in said motor housing having a shaft projecting into said gear housing, a gear plate at the end of said gear housing farthest from said motor housing, a cam housing beyond4 said gear plate and secured to said plate and said gear housing, a drive shaft rotatably supported in said cam housing and extending into said gear housing, gear means connecting said motor shaft and said drive shaft, a striker lhousing secured to the end of said cam housing, a striker bar mounted in said striker housing for axial movement, said bar projecting into said cam housing, a cam carried by said bar having a circular cam track facing said drive shaft, a cam follower on said'drive shaft for operative engagement with said cam, a spring in said cam housing urgingsaid cam toward said drive shaft, and means beyond said striker bar for attaching a t'amping tool for abuttingendto-endvrelation tosaid striker bar.

LAWSON TARWATER.

References Cited in the file of this patent UNITED STATES PATENTS Number 

